Jones (CRU) Air Temperature Anomalies Version 4: CRUTEM4

Global gridded (5°x5°) monthly anomalies of observed air temperature and combined observed air and marine temperature (HADCRU4) from the mid 1800's to near present.Current version is V4.2.0 which was put out 5/9/2013.
More Details...

See the Hadley Centre for more details. This version is 4.1.1. The
air temperature page is from monthly station temperature time series. A version that is variance corrected
(CRUTEM4V) is available.
The technique for the variance adjusted dataset can be found at Jones et. al (2001).Note the companion dataset HADCRUT4 Combined Air Temperature/SST Anomalies. Also note that if you would like a climatology, there is a 1961-1990 LTM file based on the HADCRUT2V data.

Please note: If you acquire CRUTEM4
data products from PSD, we ask that you acknowledge us in your use of the
data. This may be done by including text such as
CRUTEM4 data provided by the NOAA/OAR/ESRL PSD, Boulder, Colorado, USA, from their Web site at
http://www.esrl.noaa.gov/psd/ in any documents or publications using
these data. We would also appreciate receiving a copy of the relevant
publications. This will help PSD to justify keeping the
CRUTEM4 data set freely available online in the
future. Thank you!